You're beginning to make me wonder if mine has a similar fault. I have always been able to see "ESP off" in red on that button. I assumed it was meant to be like that.
I tried to turn it off in the snow the other day, and the red writing on the button never changed. I got some sort of message on the MFD but it didn't stay long enough for me to see what it was about.
I'm seeing an occasional appearance of a yellow icon of a car with skid marks under it, but it only shows up several seconds after it's blindingly obvious that the car is skidding in the snow. Which seems pretty useless.
Yes, I know, go read the manual, but if anyone has any tips, they'd be welcome.
Rolfe.